MAX1401_02 datasheet(1/36 Pages) MAXIM

Part #	MAX1401

Description	3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC

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Manufacturer	MAXIM [Maxim Integrated Products]

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+3V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

________________________________________________________________ Maxim Integrated Products

1

19-1480; Rev 1; 7/02

EVALUATION

KIT

AVAILABLE

General Description

The MAX1401 18-bit, low-power, multichannel, serial-

output ADC uses a sigma-delta modulator with a digital

decimation filter to achieve true 16-bit accuracy. The

user-selectable decimation factor of the digital filter

allows the conversion resolution to be reduced in

exchange for a higher output data rate. The device

achieves true 16-bit performance at an output data rate of

up to 480sps. In addition, the modulator sampling

frequency may be optimized for either lowest power

dissipation or highest throughput rate. The MAX1401

operates from +3V.

This device offers three fully differential input channels

that can be independently programmed with a gain

between +1V/V and +128V/V. Furthermore, it can com-

pensate an input-referred DC offset (such as system off-

set) up to 117% of the selected full-scale range. These

three differential channels may also be configured to

operate as five pseudo-differential input channels. Two

additional, fully differential system-calibration channels

are provided for gain and offset error correction. External

access is provided to the multiplexer (mux) output to

facilitate additional signal processing.

The MAX1401 can be configured to sequentially scan all

signal inputs and provide the results through the serial

interface with minimum communications overhead. When

used with a 2.4576MHz or 1.024MHz master clock, the

digital decimation filter can be programmed to produce

zeros in its frequency response at the line frequency

and associated harmonics, ensuring excellent line rejec-

tion without the need for further postfiltering.

The MAX1401 is available in a 28-pin SSOP package.

Applications

Portable Industrial Instruments

Portable Weigh Scales

Loop-Powered Systems

Pressure Transducers

Features

o 18-Bit Resolution, Sigma-Delta ADC

o 16-Bit Accuracy with No Missing Codes to 480sps

o Access to the Mux Output/ADC Input

o Low Quiescent Current

250µA (operating mode)

2µA (power-down mode)

o 3 Fully Differential or 5 Pseudo-Differential Signal

Input Channels

o 2 Additional Fully Differential Calibration

Channels/Auxiliary Input Channels

o Programmable Gain and Offset

o Fully Differential Reference Inputs

o Converts Continuously or On Command

o Automatic Channel Scanning and Continuous

Data Output Mode

o Operates with Analog and Digital Supplies

from +2.7V to +3.6V

o SPI™/QSPI™-Compatible 3-Wire Serial Interface

o 28-Pin SSOP Package

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

SCLK

DIN

DOUT

INT

VDD

DGND

AIN5

CALOFF+

CALOFF-

REFIN+

REFIN-

CALGAIN+

CALGAIN-

AIN6

AIN4

AIN3

AIN2

AIN1

V+

AGND

ADCIN-

ADCIN+

MUXOUT-

MUXOUT+

RESET

CS

CLKOUT

CLKIN

SSOP

TOP VIEW

MAX1401

SPI and QSPI are trademarks of Motorola, Inc.

Pin Configuration

Ordering Information

28 SSOP

PIN-PACKAGE

TEMP RANGE

0°C to +70°C

-40°C to +85°C

MAX1401EAI

MAX1401CAI

PART

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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